Preparation of Liquid Crystal Film Capable of Shielding Visible Light Band by Two‐Phase Coexistence

Abstract

A broadband reflective film covering the visible region is prepared by twice crosslinking polymerization of active monomer at different temperatures. The system is transformed from cholesteric phase to twist grain boundary A phase with the decrease of temperature. Based on the temperature dependence of pitch in two‐phase coexistence system, the polymer networks formed by free‐radical polymerization fix a part of small pitch when the system is in cholesteric phase at high temperatures, and then the large pitch is fixed by cationic polymerization when system is in twist grain boundary A phase at low temperatures. The non‐uniform distribution of pitch is formed in the system so that the reflection band of the film is broadened. © 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 599–606

Broadband reflection in polymer-stabilized cholesteric liquid crystalsviaspin-coating MoO2nanoparticles

“…Many efforts have been put into the reflection bandwidth of cholesteric crystals (ChLC) in recent years. 19–31 J. B. Guo et al 21 created polymer-stabilized cholesteric liquid crystal (PSCLC) films by introducing polymer networks.…”